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feat(conversions): add input validation and lowercase support to excel_title_to_column #14872

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feat(conversions): add input validation and lowercase support to excel_title_to_column #14872

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feat(conversions): add input validation and lowercase support to exce…
Jun 29, 2026
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style(conversions): shorten ValueError message to comply with ruff E5…
Jun 29, 2026
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17 changes: 16 additions & 1 deletion conversions/excel_title_to_column.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,23 @@ def excel_title_to_column(column_title: str) -> int:
28
>>> excel_title_to_column("Z")
26
>>> excel_title_to_column("a")
1
>>> excel_title_to_column("ab")
28
>>> excel_title_to_column("")
Traceback (most recent call last):
...
ValueError: Column title must contain only alphabetic characters.
>>> excel_title_to_column("A1")
Traceback (most recent call last):
...
ValueError: Column title must contain only alphabetic characters.
"""
assert column_title.isupper()
if not column_title or not column_title.isalpha():
raise ValueError("Column title must contain only alphabetic characters.")

column_title = column_title.upper()
answer = 0
index = len(column_title) - 1
power = 0
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